Lac Sébastien is a Lake located in Saint-David-de-Falardeau; Le Fjord-du-Saguenay, Quebec and has an elevation of 174 meters.

• Latitude: 48° 39' 29'' North   (decimal: 48.6580988)
• Longitude: 71° 10' 1'' West   (decimal: -71.1670323)
• Topography Feature Category: Lake
• Geographical Feature: Lac
• Canadian Province/Territory: Quebec
• Elevation: 174 meters
• Location: Saint-David-de-Falardeau; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Lac Sébastien
• GPS Coordinate Locator Map: Lac Sébastien Lat/Long